A motor control apparatus includes an inverter, a driver, a negative voltage circuit, a voltage dividing circuit, and a detection unit. The inverter includes an upper-arm switching element and a lower-arm switching element to supply a voltage of a node between the upper-arm switching element and the lower-arm switching element to a motor as a phase voltage. The driver applies a first voltage or a second voltage to the upper-arm switching element to control and turn the upper-arm switching element on and off. The negative voltage circuit supplies a voltage lower than the voltage of the node to the driver as the second voltage. The voltage dividing circuit performs voltage division between the negative voltage circuit and a negative power supply. The detection unit outputs a signal based on a voltage resulting from the voltage division by the voltage dividing circuit.

The embodiments of the present disclosure relate to a steering apparatus and an assembly method thereof, may provide a steering apparatus and an assembly method thereof capable of reducing the fluctuation range of torque ripple in using a double motor and double reducer structure, thereby relieving a fatigue and discomfort of a driver.

The embodiments of the present disclosure relate to a steering apparatus and an assembly method thereof, may provide a steering apparatus and an assembly method thereof capable of reducing the fluctuation range of torque ripple in using a double motor and double reducer structure, thereby relieving a fatigue and discomfort of a driver.

A recirculating ball power steering system includes an electric motor. The system also includes a ball screw rotatably driven by the electric motor. The system further includes a ball nut translatable along the ball screw in a linear direction during rotation of the ball screw. The system yet further includes a sliding joint in sliding contact with an outer surface of the ball nut, the sliding joint moveable in a non-parallel direction relative to the linear direction of the ball nut.

A recirculating ball power steering system includes an electric motor. The system also includes a ball screw rotatably driven by the electric motor. The system further includes a ball nut translatable along the ball screw in a linear direction during rotation of the ball screw. The system yet further includes a sliding joint in sliding contact with an outer surface of the ball nut, the sliding joint moveable in a non-parallel direction relative to the linear direction of the ball nut.

A frame is an aluminum die-cast product and includes a frame main body and a frame hole. The frame main body is placed at an inside of an opposite part of a case tubular portion, which is opposite from a case bottom portion. An outer wall of an outer peripheral portion of the frame main body is opposed to an inner wall of the case tubular portion. A receiving space is formed by the frame main body, the case tubular portion and the case bottom portion. The frame hole is formed in a center part of the frame main body. A stator is received in the receiving space. A rotor is rotatable together with a shaft. A seal member is placed between the case tubular portion and a housing of a rack gear and can liquid tightly seal between the case tubular portion and the housing.

An optical sensor, an optical encoder, a torque detection apparatus, and an electric power steering apparatus less affected by fluctuations in the amount of detected light and with an improved resolution are provided. The optical sensor includes a first polarizing layer that splits incident light to light with a first polarization direction, a first photoreceiver that receives first polarized light split by the first polarizing layer, a second polarizing layer that splits the incident light to light with a second polarization direction, and a second photoreceiver that receives second polarized light split by the second polarizing layer. The first photoreceiver and the second photoreceiver are positioned alternatingly and spaced uniformly with each other.

A vehicle is provided including an electronic power steering system, an electronic throttle control system, and a stability control system.

In a rotary electric machine having an integrated drive control device, a motor housing joined to a mounting housing, which is a cast member, is made of a steel material. Therefore, an outer diameter is reduced and strength for retaining a stator core is satisfactorily ensured even under high-temperature environments.

An electric power steering device (1) according to the present invention includes: a gearbox; and a driving control unit (4) connected to the gearbox through a mounting-portion contact surface (7). The driving control unit (4) includes an outer-diameter gradually increasing surface (11) formed on one end portion thereof, the outer-diameter gradually increasing surface (11) being connected so that an outer diameter thereof on the mounting-portion contact surface (7) matches with an outer diameter of the gearbox. Thus, it is possible to prevent a liquid from entering inside through the mounting-portion contact surface (7), thereby preventing electrical insulating properties of internal electric components from being lowered.